What's a good sunburn remedy for an infant?

Mild burn: HC cream. Hydrocortisone cream (hc 1% cream) is over-the-counter, and helps when used twice a day for 3-4 days on mild sunburns. Parents should take their infant to the doctor if the infant is under 3 months old, if the sunburn area is more severe than just some redness, if the skin seems quite painful, if the infant is too fussy, if the sunburn covers more than 1/3 of the baby, etc. . .
A Good Memory. "an ounce of prevention is worth a pound of cure." once the damage has been done, arguably, the best remedy is to do better next time: loose-ftting ctton comfortable outfit with sleeves; a wide-brimmed sun-hat, paba-free sunscreen, and a beach umbrella!
Cool compresses. When you notice a sunburn the damage has already been done. You basically are trying to make the child comfortable. Cool compresses can actually reduce some stored heat that may still be present in the skin. Analgesics such as Acetaminophen or ibuprophen should help with pain. Aloe may also be soothing.